James Morse 7209c86860 arm64: mm: Set PSTATE.PAN from the cpu_enable_pan() call ... Commit 338d4f49d6 ("arm64: kernel: Add support for Privileged Access Never") enabled PAN by enabling the 'SPAN' feature-bit in SCTLR_EL1. This means the PSTATE.PAN bit won't be set until the next return to the kernel from userspace. On a preemptible kernel we may schedule work that accesses userspace on a CPU before it has done this. Now that cpufeature enable() calls are scheduled via stop_machine(), we can set PSTATE.PAN from the cpu_enable_pan() call. Add WARN_ON_ONCE(in_interrupt()) to check the PSTATE value we updated is not immediately discarded. Reported-by: Tony Thompson <anthony.thompson@arm.com> Reported-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: James Morse <james.morse@arm.com> [will: fixed typo in comment] Signed-off-by: Will Deacon <will.deacon@arm.com>		2016-10-20 09:50:53 +01:00
..
boot	Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata	2016-10-14 11:41:28 -07:00
configs	ZTE arm64 defconfig updates for 4.9:	2016-09-19 22:35:21 +02:00
crypto	crypto: arm64/aes-ctr - fix NULL dereference in tail processing	2016-09-13 18:44:59 +08:00
include	arm64: cpufeature: Schedule enable() calls instead of calling them via IPI	2016-10-20 09:50:53 +01:00
kernel	arm64: cpufeature: Schedule enable() calls instead of calling them via IPI	2016-10-20 09:50:53 +01:00
kvm	KVM updates for v4.9-rc1	2016-10-06 10:49:01 -07:00
lib	Merge branch 'work.uaccess' into for-linus	2016-10-14 20:42:44 -04:00
mm	arm64: mm: Set PSTATE.PAN from the cpu_enable_pan() call	2016-10-20 09:50:53 +01:00
net	arm64: bpf: optimize LD_ABS, LD_IND	2016-06-10 23:11:50 -07:00
xen	arm/xen: add support for vm_assist hypercall	2016-07-06 10:42:14 +01:00
Kconfig	arm64: kaslr: keep modules close to the kernel when DYNAMIC_FTRACE=y	2016-10-17 16:24:02 +01:00
Kconfig.debug	arm64: always enable DEBUG_RODATA and remove the Kconfig option	2016-08-26 10:13:41 +01:00
Kconfig.platforms	ARM: 64-bit DT updates for v4.8	2016-10-07 21:32:39 -07:00
Makefile	arm64: Set UTS_MACHINE in the Makefile	2016-08-31 12:31:38 +01:00